Oil stove



Nov l3 W23.

R. HOFFMAN OIL STOVE 2 Sheets-Shet 1 FilecbJuly 19, ,1919

Nov. 13, 11923.

R. HOFFMAN 01L STOVE Filed July 19. 1919 2 Sheets-Sheet 2 atentecl Nov.13, 1923.

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RUDOLPH HOFFMAN, OF KANKAKEE, ILLINOIS, ASSIGNOR TO SEARS, ROEBUCK AND00., OF CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK.

OIL STOVE.

Application filed July 19, 1919. Serial No. 311,953.

T all whom it may concern e it known that I, RUDOLPH HOFFMAN, a citizenof the United States, residing at (a kakee, in the county of Kankakeeand State of Illinois, have invented certain new and useful Improvementsin Oil Stoves, of which the following is a specification.

The invention relates to oil stoves of the type embodying aconstant-level oil supply reservoir and one'or more burners adapted tobe raised and lowered with reference to said constant level whereby tocontrol the flow of oil from the reservoir to the burners. Such burnersare usually supported beneath the stove top upon a horizontal stationarysupply pipe, and to permit of the vertical movement of the burners withreference to said pipe an extensible pipe connection is employed betweenthe burner and supply pipe comprising two telescoping pipe sections.

Owing to the tendency of the oil to creep along a metallic surface bycapillary attraction, I provide a liquid metallic seal of 25 mercury orthe like for the joint between said pipe sections, which absolutelyprevents the leakage of oil. One of the objects of this invention is toprovide means of advantageous construction to form a closure forretaining such mercury against escape when the stove is tipped up uponend or inverted as in shipping.

Another object of the invention is to provide improved means foreffecting the raising and lowering movements of the burner withreference to the c0nstant-oil level.

In the, accompanying drawings, I have illustrated a preferred form of myinven tion. Fig. 1 is a side elevation of the lower portionof an oilburner supported upon a stationary horizontal supply pipe. Fig. 2 is avertical sectional view taken on line 2-2of Fig. 1. Fig. 3 is ahorizontal section taken on line 3-3 of Fig. 1. Fig. 4 is a 45 verticalsection taken on line 44 of Fig. 1. Fig. 5 is a horizontal section takenon line 5-5 of Fig. 4. Fig. 6 is a horizontal section taken on line 66of Fig. 1. Fig. 7 is a fragmentary side elevation showing'details ofconstruction.

- In the drawings 1 designates the bowl or trough of an oil burnermounted upon a stationary horizontal pipe2 which receives a supply ofoil from a constant-level oil .reservoir (not shown) of well-knownconstruction. 3 indicates generally an extensible pipe connectionbetween the trough 1 and pipe 2, by means of which a supply of Theextensible connection 3 between the burner bowl or trough 1 of theburner and the supply or delivery pipe 2 comprises two sections 3 and 3carried respectively by the pipe 2 and trough 1. The inner section 3 ismade of a diameter slightly less than the diameter of the outer section3" and at its lower end is screw-threaded into a fitting 4 connected ina well-known manner to the delivery pipe 2 so as to communicatetherewith. The pipe section 3 is rigid with the lower edge or" theburner bowl 1, being secured thereto as by brazing, and is adapted tofreely receive the section 3*.

The means for clamping the fitting 4 upon the delivery pipe 2 so that itshall be capable of firmly supporting the burner in its proper position.comprises a pair of links 5 and 6 operatively engaging with studs 7 and8 upon opposite sides of the fitting and similarly connected to anintermediate block 9 below the pi e 2. Said block has a set screw 10therein'adapted to operatively engage with the pipe 2. By simplytightening said screw, the fitting 4 may be drawn downwardly onto thedelivery pipe 2 and firmly clamped in position thereon.

For the purpose of providing an annular channel around the inner pipesection 3 of the extensible pipe connection 3, for the reception ofaquantity of mercury or the like in which the lower end of the pipesection 3" may be immersed, I provide a tubular stem or member 11carried by the fitting 4. This member is in the form of a pipe of adiameter substantially greater than the diameter of the 'pipe section 3*and at its lower end is threaded into a socket 12 provided'in the upperportion of the fitting 4. The pipe section 3 and the tubular member 11are thus concentrically arranged and are spaced apart to form a channel13. Said channel is filled with a sealing liquid such as mercury 14 to adepth sufficient to cover the lower end of the outer pipe section 3 inall operative positions of the latter relative thereto. It will be seenthat oil standing in 2 arms 13 rigid with the burner bowl 1. They lever15 comprises a hand portion 15 and a bifurcated portion 15 the arms ofthe lat ter being entered through slots 19 in the bracket 16. Hereinsaid bracket is formed by. an upward extension of the link 5, the upperend of the bracket being bent to fo'rma lateral portion 16 which isapertured to receive the stem 11. Upon the outer side of said bracket 16is secured a plate 20 (Fig.

2) bent to form a journal bearing E20 for a pivot 21 the opposite endsof which extend through the arms of the bifurcated portion of the leverto provide a pivotal mounting for the latter. The vertically c movablemember 17 is substantially U- shaped, comprising an upright portion 17having two laterally extending arms 17 apertured to receive the stem 11.The arms of the bifurcated portion of the'lever after i passing throughthe slots 19 in the bracket 16 pass on opposite sides of the stem (Fig.5) and operatively engage in slots 22 provided in the upright portion 17of the member 17. The pendant arms 18 of the burner are secured to themember 17 so as to be readily detachable therefrom whereby to permit ofthe removal of the burner from its supporting means. To this end theopposite edges of the member 17 are provided withnotches 23 forreceiving tongues 24 formed on the lower ends of the arms 18 spacedapart (Figs. 6 and 7) and beaded to receive the legs of a U-shapedmember or staple 25 upon the forward side of the upright portion of themember 17. To permit of the insertion of the staple25 into thebeaded'ends of the arms 18 in the notches 23, the upper arm of theU-shaped member 17is notched at its side edges as at 26. At

their their upper ends the pendant arms 18 are brought together and aremade of a width adapted to fit neatly within the burner bowl 1 to whichthey are rigidly secured in any suitable way.

a It will be seen that by operating the lever 15 the burner may beeasily raised or lowered withvreference to the supply pipe 2. The upwardmovement of the burner is limited by the upper arm 17 of the U-shapedmember 17 en agin with the laterall exe c. e: V

tending portion 16 of the bracket 16, and the extent of downwardmovement is limited by an annular member or collar 27 fixed movements.

upon the outer pipe section 3 of the extensible pipe connection andadapted to engage with the upper end of the stem 11.

It will be seen that the annular channel 13 formed between the stem 11and the inner pipe section 3 is normally open in the operative positionof the parts, so that if the stove is tipped upon end or inverted, the

mercury will escape from the channel un less prevented. In the presentinstance to prevent such escape of the mercury, the fitting 4: has castintegral therewith a stora e receptacle or chamber in the form of a cyinder 28, and a passage 29 is provided in the casting between the lowerend of. the channel 13 and thelower end of the cylinder. This passage isadapted to be controlled by a valve member 30 screw-threaded into thecasting (Fig. 3) and having a knurled head 31 by means of which it maybe operated. The parts are so arranged that when the valve is open, themercury will flow by grav ity through said passageway into the cylinder,the lower end of the latter being disposed a substantial distance belowthe lower end of the mercury channel 13. Upon closing the valve, themercury is effectively retained in the cylinder 28 so that the stove maybe placed in any position desired without danger of the mercuryescaping.

After the stove has been set up into its operative position, it is onlynecessary to open the valve 30 and force the mercury through the passage29into the lower end of the channel again This. may be accomplished bymeans of a plunger 32 mounted within the cylinder 23 and operable bymeans of a stem 33 operatively engaging the plunger at its upper end andhaving a screw-threaded engagement with a nut 34 screwed into the upperend of the cylinder. Upon the upper or outer end of the stem 33 is aknurled head 35 by means of which the plunger may be operated. lVith thevalve 30. open, when the plunger is raised, the mercury flows into thelower end of the cylinder for storage therein while the stove is beingshipped, and when the plunger is lowered, it forces the mercury from thecylinder intothe lower end of the channel, after which the valve membermay be moved into closed position.

If the burner is lowered too rapidly or very suddenly, the displacementof the oil in the extensible pipe connection by the lower end of theouter pipe section 3",

causes the oil to spurt upwardly in the burner bowl 1 producing asplash. To overcome this objection, means may be provided for retardingthe movement of the hand lever. arcuate member 36 mounted uponthebracket 16 and adapted to be frictionally engaged by the lever 15 inits up and down Said varcuate member may Herein I have provided ancomprise a pairof spaced arms 37 (Fig. 5) adapted to engage withthe/opposite sides of the-hand portion 15 of the lever and thusproviding agnideway therefor. Upon the forward one of said arms 37suitable legends may be inscribed to indicate to the user the properpositions for the burner in use. Thus the words Light, Medium '5 and Outare inscribedupon the arms (Fig l) to indicate that when the lever ispositioned opposite these words, the burner is respectively positionedwith its upper edge just above the constant oil level, 1s

' partially raised above the oil level, oris wholly raised above the oillevel. The frictional' engagement of the arms 37 with the lever 15 alsoinsures that the burner may be maintained in any desired positionagainst the action of gravity.

It will be seen that I have provided in an oil tove employing mercury orthe like for preventing the leakage of oil past the joint between. thepipe sections of the extensible pipe connection, means of advantageousconstruction for retaining the liquid when the stove is inverted, as inshipment. The raising and lowering means for the burners are alsoadvantageous, being simple in construction and easily operable to effectthe raising and lowering movement of the burners as may be desired.Claims directed to the mercury seal per se are contained in my copendingapplication Serial No. 308,542, filed July 3, 1919; and the claims drawnto the raising and lowering means have been divided out and placed in mycopending application, Serial No. 509,376 filed October 21, 1921, whichis a continuation in part of this application.

While I have herein illustrated and described the invention withconsiderable particularity, I desire to have it understood that in theinterpretation of the appended claims they are not to be limited exceptas may be necessitated by the state of the prior art. I

I claim as my invention:

1. In an oil stove, the combination of an oil supply pipe and a burnermounted for vertical movement with reference to said pipe, of anextensible pipe connection between said burner and said pipe comprisinga pair of telescoping pipe sections, means providing an annular channelfor the re ception of a metallic liquid for sealing the joint. betweensaid pipe sections, and a chamber in valved communication with saidchannel adapted to receive such metallic liquid and retain it while thestove is inverted.

2. In an oil stove, the combination with an oil supply pipe and aburner, of means for raising and lowering the burner, and means forconducting a supply of oil to the burner comprising a sectional pipe,means providing a metallic liquid seal for sealing the joint betweensaid pipe sections, and means providing a separate chamber for receivingthe metallic liquid when the stove is to be inverted.

V '3. In an oil stove, the combination with an oil supply pipe and aburner, of means for raising and lowering the burner, and means forconducting a supply of oil to the burner comprising a sectional pipe,means providing a metallic liquid seal for sealing the joint betweensaid pipe sections, an auxiliary chamber adapted to receive the metallicliquid, and valve means for closing said chamber.

4; In an oil burner, the combination with an oil supply pipe and aburner, of a fitting on the supply pipe, an extensible pipe conmotionbetween the burner and supply pipe comprising [an inner pipe sectionrising from the fitting and an outer pipe section depending from theburner, a tubular stem surrounding the inner pipe section and adapted toform therewith a channel for receiving the outer pipe section and aquantity of mercury or the like, a chamber below the lower end of saidchannel, a passageway connecting said channel with said chamber, and avalve for controlling said passa e-way.

5. n an oil burner, the combination with an oil supply pipe and aburner, of a fitting on the supply pipe, an extensible pipe connectionbetween the burner and supply pipe comprisingan inner pipe sectionrising from the fitting and an outer pipe section depending from theburner, a tubular stem surrounding the inner pipe section and adapted toform therewith a channel for receiving the outer pipe section and aquantity of mercury or the like, a chamber below the lower end of saidchannel, a passage-way connecting said channel with said chamber, and avalve for controlling said passageway, and means for forcing the mercuryfrom the chamber to the channel by way of said passage-way.

6. In an oil stove, the combination with a source of oil supply and aburner, of a fittingv communicating with said source of supply, a pairof relatively stationary pipe sections rising from said fitting andspaced apart to form an annular channel therebetween for the receptionof mercury or the like, a relatively movable pipe section rigid withsaid burner and adapted. to depend into said mercury, a cylinder havingits lower end terminating a substantial distance below the lower end ofsaid channel and in valve-controlled communication therewith, and aplunger operable in said cylinder to force the mercury therefrom intosaid channel by way of said passage.

7. In an oil stove, the combination with a burner and a source of oilsupply, of an extensible pipe connection including a pair of telescopingpipe sections between said source of supply and said burner and having ametallic liquid seal between the relatively movable pipe sections, andmeans forming a closure for said metallic liquid while the stove isinverted comprising a cylinder, valve-controlled means for admitting theliquid seal to and from said cylinder, and means for forcing themetallic liquid to pass from said cylinder into its operative position.I

8. An oil stove having an extensible pipe connection including a pair oftelescoping pipe sections, a chamber surrounding said pipe connectionfor receiving a'quantity of mercury or the like to seal the jointbetween said pipe sections, and an auxiliary storage chamber invalve-controlled communication with the first mentioned chamber. 9. Inan oil stove, the combination with a source of oil supply and a burner,of an extensible pipe connection between said source of oil supply andthe burner having a sliding joint, means forming an annular chamber forthe reception of a mercury seal for the joint of said extensible pipeconnection, means providing a chamber for the reception of the mercury,and means for causing the mercury to pass 'from one of said chambers tothe other.

10. In an oil stove, the combination with an oil burner and a source ofoil supply, of a'sectional pipe connection, a cylinder having a plungertherein, a screw stem for opcrating said plunger, an annular channel forreceiving a quantity of mercury or the like adapted to seal the jointbetween the sections ot said pipe connection and valve-controlled meansfor controlling the flow of mercury between said channel and saidcylinder.

11. In an oil stove, the combination with a source 01 oil supply and aburner, of an extensible pipe connection between said source of oilsupply nd the burner having a sliding joint, means forming an annularchamber for the reception of a mercury seal for the joint of saidextensible pipe connection, means providing a chamber for the receptionof the mercury, and valve-controlled means for controlling the fiow ormercury between said chambers.

12. The combination of an oil supply pipe, a burner, means providing anextensible pipe connection between said pipe and said burner permittingof the up and down movements of the latter, means providing a seal toprevent the leakage of oil by capillary attraction from said extensiblepipe connection including a chamber for supporting a quantity of mercuryor the like, and an auxiliary chamber for receiving the mercury o as toretain it in the inoperative condition of the burner. a

13.. The combination of an oil supply pipe, a burner mounted for up anddown movement and having an extensible pipe connection with said supplypipe, means including a chamber associated with said connectionproviding a metallic liquid seal therefor, and means independent of saidchamber for providing a closure for the metallic liquid adapted to besealed to prevent the escape of mercury therefrom.

let. In an oil stove, the combination with a source of oil supply and aburner, of an extensible pipe connection between said source of supplyand said burner compris ing two telescoping sections having a metallicliquid seal therebetween, means providing a chamber adapted to receivesuch metallic liquid, means forming a passageway connecting said chamberwith said channel, and means for controlling the flow of the metallicliquid between said channel and chamber.

15. An extensible conductor for oil or other fluid comprising twotelescopingpipe sections, a chamber for retaining a quantity of mercuryor the like into which the free end of the outer pipe section is adaptedto be immersed, and an auxiliary chamber for the mercury incommunication with the first chamber.

16. In an oil stove, the combination of a stationary oil supply pipe, 3,burneiyan extensible connection between said pipe and said burnerpermitting of the up and down movements-of the latter, said connectioncomprising a pair of telescoping pipe sections, means providing achamber for the reception of a metallic liquid in which the free end ofthe outer pipe section is adapted to be immersed, an auxiliary storagechamber communicating with the first chamber, and

my hand.

Y 7 RUDOLPH HOFFMAN.

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